A method for measuring the arc of a segment of a continuous caster

Abstract

The present application relates to a kind of continuous casting machine sector segment arc measurement method, comprising the following steps: S1, setting measuring device;S2, the arc-shaped roller group of sector segment is divided into several segment measurement sections, and at least one roller coincides between adjacent measurement sections;S3, measurement section roller position deviation measurement;S31, the reference plane both ends of measuring device are respectively with the roller surface of 1# roller and n# roller;S32, range finder is moved from one end of linear guide rail to the other end, range finder is sequentially scanned through 1# roller to n# roller, and measurement data is collected, and the longitudinal distance corresponding to 1# roller to n# roller is respectively recorded as H1 to H n , and the displacement data L corresponding to H1 to H n Position is respectively recorded as L1 to L n ;S33, according to H1 to H n , and L1 to L n , obtain the position information of measurement section, and confirm the offset of 2# roller to n# roller;S4, sequentially to all measurement sections measurement;S5, the position information of all measurement sections is integrated, and the arc information of entire arc-shaped roller group is obtained.

Description

Technical Field

[0001] This invention relates to the field of equipment maintenance technology, specifically to a method for measuring the arc of a sector segment in a continuous casting machine. Background Technology

[0002] The sector section of a slab continuous casting machine is also known as the casting flow guiding system. It consists of numerous idler rollers 11, whose purpose is to compress, guide, and support the casting flow. (See appendix) Figure 1 The sector segment comprises two arc-shaped roller groups 1, one above the other, each consisting of multiple support rollers 11 evenly arranged along the arc. Due to the harsh working environment and prolonged operation and stress, the roller surfaces deform and wear, and the support points shift and sink, ultimately causing the support rollers 11 in the arc segment group 1 to deviate, a phenomenon known as sector segment arc deviation. When the arc deviation exceeds the specified range, it can cause corner cracks and longitudinal cracks in the cast billet, resulting in a large number of substandard billets and severely impacting the company's economic benefits. Therefore, the arc measurement operation of the sector segment in the continuous casting machine is a crucial step in the entire continuous casting machine construction process and the most effective means of inspecting the installation quality and online status of the sector segment, the two-in-one continuous casting equipment, and other related components.

[0003] Currently, arc measurement is performed manually by placing a traditional standard measuring arc plate in the gap between the two arc roller groups 1 on the upper and lower part of the sector section and then using a feeler gauge. However, there are many uncertain factors in the process, such as the placement position of the standard measuring arc plate, the verticality of the standard measuring arc plate, the surface smoothness of the rollers, and the measurement techniques of the construction personnel. All of these factors have a significant impact on the arc measurement data, which cannot truly reflect the accurate values. Adjustments after measurement are difficult, and data adjustments are often made based on the experience of on-site construction personnel. The measurement structure is also inaccurate, and the entire operation process is complex and labor-intensive. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a method for measuring the arc of a sector segment in a continuous casting machine, which can improve the efficiency and accuracy of sector segment arc measurement, determine the arc deviation, and facilitate maintenance and adjustment.

[0005] To achieve the above objectives, the present invention provides a method for measuring the arc of a sector segment in a continuous casting machine, comprising the following steps:

[0006] S1. A measuring device is set up, the measuring device includes a base plate, a linear guide rail mounted on the base plate, a rangefinder mounted on the linear guide rail, and a displacement recording module for acquiring the displacement of the rangefinder on the linear guide rail. The bottom of the base plate has a reference plane parallel to the linear guide rail. The rangefinder moves linearly along the linear guide rail and faces the reference plane.

[0007] S2. Divide the arc-shaped roller group of the sector segment into several measurement segments from one side to the other. Each measurement segment includes n rollers, n≥2, and at least one roller overlaps between adjacent measurement segments.

[0008] S3. Measurement of the position deviation of the measuring section idler roller:

[0009] S31. The rollers of the measuring section are labeled as roller #1 to roller #n from one side to the other. The two ends of the reference plane of the measuring device are respectively aligned with the roller surfaces of roller #1 and roller #n, and the linear guide is perpendicular to the roller axis.

[0010] S32. Move the distance measuring instrument from one end of the linear guide to the other. The distance measuring instrument scans sequentially over rollers #1 to #n and collects measurement data. The displacement recording module records the displacement data L of the distance measuring instrument. A minimum value will appear when the distance measuring instrument scans over each roller, which is recorded as the longitudinal distance H. Record the longitudinal distances corresponding to rollers #1 to #n as H1 to H2 respectively. n And will be related to H1 to H n The displacement data L at the corresponding positions are denoted as L1 to L2 respectively. n ;

[0011] S33, According to H1 to H n and L1 to L n Determine the positions of rollers 2 to n relative to roller 1, obtain the position information of the measurement section, and confirm the offset of rollers 2 to n.

[0012] S4. Following the method in step S3, measure all measurement segments in sequence;

[0013] S5. Integrate the position information of all measurement segments to obtain the curvature information of the entire arc roller group, and determine the offset of each idler roller in the entire arc roller group.

[0014] Furthermore, the measuring device also includes a camera mounted on the linear guide rail and moving synchronously with the rangefinder. In step S31, the camera simultaneously captures images of the measuring section. In step S32, when the data measured by the rangefinder is compared with the idler roller, the images captured by the camera are used for verification.

[0015] Further, in step S33, the method for determining the position of idler rollers 2# to n# is as follows: A coordinate system is established with the center of idler roller 1# as the origin, where the X-axis is parallel to the linear guide rail, the Y-axis is along the radial direction of idler roller 1#, and the coordinates of idler roller i# are: X... i =L i -L1, Y i =H i -H1, 2≤i≤n.

[0016] Further, in the measuring section, the radius of the arc of the center of the roller is R, and the angle of the circle of the centers of the adjacent rollers is θ, in the step S33, the offset of the 2# roller to the n# roller is determined as follows: for any i# roller, 2≤i≤n, the offset in the Y direction ΔY i = H i - H1-a i , a i = 2Rsin[(i-1)θ / 2]sin[(n-i)θ / 2], and when ΔY i < 0, the i# roller is offset to the inner side, and when ΔY i > 0, the i# roller is offset to the outer side; the offset in the X direction ΔX i = L i - L1-b i , b i = 2Rsin[(i-1)θ / 2]cos[(n-i)θ / 2], and when ΔX i < 0, the i# roller is offset to the side close to the 1# roller, and when ΔX i > 0, the i# roller is offset to the side away from the 1# roller.

[0017] Further, the step S5 further comprises: establishing a model of the arc-shaped roller group according to the arc information of the arc-shaped roller group.

[0018] Further, the step S1 further comprises: after the measuring device is assembled, first calibrating.

[0019] Further, the calibration method of the measuring device comprises: measuring the arc-shaped roller group by using a standard measuring arc plate to obtain reference data, measuring the arc-shaped roller group in the same way as the step S3 to obtain measuring data, and comparing the measuring data with the reference data to check, when the error between the two is within a specified range, it is considered that the measuring device meets the requirements, and the calibration is completed, otherwise, the measuring device is adjusted and re-compared and checked until the requirements are met.

[0020] Further, the step S1 further comprises: establishing a deflection error table of the measuring device under different use conditions; and in the step S31, H1 to H n are corrected according to the deflection error table.

[0021] Further, when the measured arc-shaped roller group is the arc-shaped roller group on the lower side of the fan-shaped section of the continuous casting machine, the measuring device is installed on a carrying device, and then placed in the gap between the two arc-shaped roller groups, and the carrying device is used to carry the measuring device to move from one end of the gap to the other end, and the measurement of all the measuring sections is sequentially completed

[0022] Further, the step S3, the measuring device measures at both ends of the roller respectively.

[0023] As described above, the present application relates to a method for measuring the arc of a segment of a continuous casting machine, and has the following beneficial effects:

[0024] The measuring device measures the arc-shaped roller group multiple times, each time in the same way, obtains the position information of each measurement section, and then integrates the position information of all measurement sections to obtain the position information of the arc-shaped roller group, thereby determining the arc of the arc-shaped roller group. The entire measurement work is highly automated, and compared with the existing manual measurement method, the labor intensity and safety risk of personnel are reduced, the arc measurement efficiency and accuracy of the segment are improved, and the offset of each roller, i.e. the adjustment amount required by the arc-shaped roller group to the arc, can be automatically calculated, thereby facilitating maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Fig. 1 is a structural schematic diagram of a segment of a continuous casting machine.

[0026] Figure 2 Fig. 4 is a structural schematic diagram of the measuring device in the present application.

[0027] Figure 3 Fig. 5 is a working schematic diagram of the measuring device in the present application on the measurement section.

[0028] Figure 4 Fig. 6 is a schematic diagram of the calculation principle of the measuring device in the present application when measuring on the standard measurement section.

[0029] ELEMENT NUMBER EXPLANATION

[0030] 1 arc-shaped roller group

[0031] 11 roller

[0032] 2 base plate

[0033] 21 reference plane

[0034] 3 linear guide rail

[0035] 4 distance measuring instrument

[0036] 5 camera DETAILED DESCRIPTION

[0037] The embodiments of the present application are described below by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification.

[0038] It is to be understood that the structure, proportion, size and the like shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the limited conditions of the implementation of the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose of the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like in the present specification are only for clear description, and are not used to limit the scope of the present application, and the change or adjustment of the relative relationship is also considered as the implementation of the present application without changing the technical content.

[0039] Reference Figures 1 to 4 The present application provides a continuous casting machine sector arc measurement method, wherein the sector of the continuous casting machine comprises two arc roller groups 1, the arc roller group 1 has a plurality of rollers 11, and is arranged along a circular arc. The continuous casting machine sector arc measurement method of the present application comprises the following steps S1-S5:

[0040] S1, setting a measuring device, referring to Figure 2 The measuring device comprises a base plate 2, a linear guide rail 3 mounted on the base plate 2, a distance meter 4 mounted on the linear guide rail 3, and a displacement recording module (not shown in the drawing) for acquiring the displacement of the distance meter 4 on the linear guide rail 3. The bottom of the base plate 2 has a reference plane 21 parallel to the linear guide rail 3. The distance meter 4 moves linearly along the linear guide rail 3, and the distance meter 4 faces the reference plane 21. The distance meter 4 can be a laser distance meter 4 or the like. Preferably, in the present embodiment, the measuring device further comprises a camera 5 mounted on the linear guide rail 3 and moving synchronously with the distance meter 4. The overall size of the measuring device is designed according to the size of the sector, and it is required to be able to enter the gap between the two arc roller groups 1 for measurement.

[0041] S2, dividing the arc roller groups 1 of the sector from one side to the other side into a plurality of measurement sections, each measurement section comprising n rollers 11, n≥2, and at least one roller 11 overlapping between adjacent measurement sections. The size of n is related to the size specification of the arc roller group 1 and the size of the measuring device, and is determined by the number of rollers 11 that the base plate 2 can cross. Specifically, in the present embodiment, referring to Figure 3 and Figure 4 The base plate 2 can cross 6 rollers 11, and the measurement section comprises 6 rollers 11.

[0042] S3, measurement of the position deviation of the rollers 11 of the measurement section, comprising the following steps S31-S33:

[0043] S31, referring to Figure 3 and Figure 4The rollers 11 of the measuring section are respectively recorded as 1# roller 11 to n# roller 11 from one side to the other side, the reference plane 21 of the measuring device is respectively in contact with the roller surface of the 1# roller 11 and the n# roller 11 at both ends, and the linear guide rail 3 is perpendicular to the roller 11 axial direction, so that the reference plane 21 is tangent to the roller surface circle of the 1# roller 11 and the n# roller 11 at both ends, see Figure 4 , the tangent points are respectively A1 and A n , and the reference plane 21 is simplified as a straight line A1A n .

[0044] S32, the distance meter 4 is moved from one end of the linear guide rail 3 to the other end, the distance meter 4 scans the 1# roller 11 to the n# roller 11 in turn, and collects the measurement data, the displacement recording module records the displacement data L of the distance meter 4, and a minimum value is generated when the distance meter 4 scans one roller 11, which is recorded as the longitudinal distance H, the longitudinal distances corresponding to the 1# roller 11 to the n# roller 11 are respectively recorded as H1 to H n , and the displacement data L corresponding to the positions of H1 to H n are respectively recorded as L1 to L n . Specifically, see Figure 3 and Figure 4 , in Figure 4 , when the distance meter 4 scans the 1# roller 11, the continuously measured value of the distance meter 4 first decreases and then increases, and an extreme minimum value is generated when the distance meter 4 is opposite to the tangent point A1, which is recorded as the longitudinal distance H1 at this time, and the displacement amount of the distance meter 4 obtained by the displacement recording module at this time is L1, and similarly, for each roller 11 in the moving process of the distance meter 4, an extreme minimum value is generated, and the value minus the distance from the distance meter 4 to the reference plane 21 is the minimum distance between the roller 11 and the reference plane 21, so from the continuous measurement data of the distance meter 4, the first to the nth extreme minimum value is found, which corresponds to H1 to H n , and the displacement amount of the distance meter 4 at the positions of H1 to H n corresponds to L1 to L n .

[0045] In this embodiment, preferably, the camera 5 is synchronously moved for shooting while the distance meter 4 is moved for distance measurement, and when the extreme minimum value in the measurement data of the distance meter 4 is corresponded to the roller 11, the screen shot by the camera 5 is used for verification, so as to ensure that H1 to H n correspond to the 1# roller 11 to the n# roller 11 respectively, and the measurement data error problem is avoided.

[0046] S33, according to H1 to H n , and L1 to L nThe positions of rollers 2# to n# relative to roller 1# are determined to obtain the position information of the measurement section and the offset of rollers 2# to n# is confirmed. The position of roller 1# is used as a reference. At this stage, it is not necessary to determine its position offset in the entire arc roller group 1.

[0047] Specifically, in this embodiment, see Figure 4 Establish a coordinate system with the center O1 of roller #11 as the origin, where the X-axis is parallel to the linear guide rail 3 and the Y-axis is along the radial direction of roller #11, i.e., the coordinates of roller #11 are (X1, Y1) = (0, 0). For any roller #11, its coordinates are (X1, Y1) = (0, 0). i Y i If X ), then X i =L i -L1, Y i =H i -H1, 2≤i≤n, thus the center coordinates of each idler roller 11 can be obtained, thereby obtaining the position information of the entire measurement section. By comparing it with the position of the idler roller 11 in the standard arc roller group 1, the offset of the idler roller 11 in the measurement section can be determined.

[0048] In this embodiment, the deviation between idler roller #2 11 and idler roller #n 11 in the measurement section is determined as follows: See Figure 4 In this measurement section, the radius of the arc containing the center of idler roller 11 is R, and the circular angle between the centers of adjacent idler rollers 11 is θ. For any i# idler roller 11, 2≤i≤n, calculate its Y-axis offset ΔY. i =H i -H1-a i a i =2Rsin[(i-1)θ / 2]sin[(ni)θ / 2], and when ΔY i When <0, roller i# shifts inward; when ΔY i >0, i# roller 11 shifts outward; X-axis offset ΔX i =L i -L1-b i b i =2Rsin[(i-1)θ / 2]cos[(ni)θ / 2], when ΔX i When <0, roller i# shifts towards the side closer to roller 1#, when ΔX i >0, i# idler roller 11 shifts away from 1# idler roller 11. Where a i b is the distance in the Y direction between idler roller 11 and idler roller 11 in the standard design of this measurement section. i This refers to the distance between idler roller #11 and idler roller #11 in the X direction. Specifically, see [link to relevant documentation].Figure 4 , Figure 4 is a schematic diagram of the position of the measuring section in the standard design, and the circle of the i# supporting roller 11 is O i A straight line parallel to the Y axis (i.e. the normal line O1A1) intersects the circular surface of the 2# supporting roller 11 at point A i , and intersects the tangent A1A n at point B i , then the length of the line segment A i B i is a i , the length of the line segment A1B i is b i , the distance between the centers O i O1 is di under the standard design, and thus the length of the line segment A i A1 is d i , the central angle θ1 corresponding to the circular arc O i O1 is (i-1)θ, the central angle θ2 corresponding to the circular arc O n O1 is (n-1)θ, θ4=(π-θ2) / 2, θ3=(π-θ1) / 2, α=θ3-θ4=(θ2-θ1) / 2=(n-i)θ / 2, then a i =d i *sinα, b i =d i *cosα, d i =2Rsin(θ1 / 2)=2Rsin[(i-1)θ / 2], according to the above calculation relationship, a i and b i can be obtained.

[0049] At this point, the corresponding data of the measuring section can be obtained, and a corresponding data table can be established to intuitively reflect the position information of the measuring section, as shown in Table 1 below:

[0050] Table 1

[0051] Roll number 1# 2# … i# … n# Longitudinal distance H [H1] [H2] … H i ]]> … H n <!-- 4 -->]]> Displacement value L ​ <L2> … [[ L i ]]> … [[ L n ]]> Center coordinates (0,0) (X2, Y2) … (X i ,Y i )]]> … (X n ,Y n )]]> X phase deviation 0 [Delta] X2 … ΔX i ]]> … ΔX n ]]> Y phase deviation 0 [Delta Y2] … Delta Y i ]] … Delta Y n ]]>

[0052] S4, measure all the measuring sections in the manner of step S3. Specifically, move the measuring device from one side of the arc-shaped roller set 1 to the other side, and measure all the measuring sections in turn. The measurement manner and principle of each measuring section are the same, and the corresponding position information is obtained.

[0053] S5, integrate the position information of all the measurement segments to obtain the position information of all the carrier rollers 11 in the entire arc-shaped roller set 1, that is, the arc information of the arc-shaped roller set 1 in the fan-shaped segment, and determine the offset of each carrier roller 11 in the entire arc-shaped roller set 1. The position data obtained in the above step S4 is the position data of each measurement segment, which is independent of each other, and adjacent measurement segments have at least one overlapping carrier roller 11. Therefore, the position data of these overlapping carrier rollers 11 is used for integration, that is, the coordinate system established in the latter measurement segment is converted into the coordinate system established in the former measurement segment. Specifically, when the number of overlapping carrier rollers 11 is greater than or equal to 2, that is, the n-1# carrier roller 11 and the n# carrier roller 11 of the first measurement segment are the 1# and 2# carrier rollers 11 of the second measurement segment, the coordinate positions of the 1# and 2# carrier rollers 11 of the second measurement segment are converted into the coordinate positions of the n-1# carrier roller 11 and the n# carrier roller 11 of the first measurement segment, and then the positions of the subsequent carrier rollers 11 in the second measurement segment are correspondingly converted. In summary, the relative positional relationship between the two coordinate systems can be determined through the two overlapping points, so as to integrate the second measurement segment and the second measurement segment data. Similarly, the subsequent measurement segments are integrated in sequence. When the number of overlapping carrier rollers 11 is 1, the positions of the coordinate systems in the latter measurement segment and the coordinate systems in the former measurement segment are corresponded, in addition to the coordinates of the overlapping carrier rollers 11, the angle relationship between the two X axes, that is, the rotation angle of the substrate 2 during the two measurements, is combined, so as to realize the integration.

[0054] The integrated data can also be represented in the form similar to Table 1 above, which is convenient for the staff to perform corresponding work according to the information table. Preferably, a model of the arc-shaped roller set 1 can also be established in three-dimensional software according to the position information, so as to more intuitively reflect the position information of the arc-shaped segment and enable corresponding adjustment.

[0055] In the embodiment, as a preferred design, the measurement device is calibrated after assembly to ensure the measurement accuracy of the measurement device in use. The calibration method of the measurement device includes: measuring the arc-shaped roller set 1 by using a standard measurement arc plate to obtain reference data, wherein the standard measurement arc plate is a standard tool used for measuring the arc-shaped roller set 1 in the existing measurement method, which meets the corresponding accuracy requirements, then measuring the arc-shaped roller set 1 in the same way as the above step S3 to obtain measurement data, and comparing the measurement data with the reference data for checking. When the error between the two is within a specified range, for example, the error between the measurement results of the two methods is less than 0.1 mm for the position of any carrier roller 11, it indicates that the measurement device meets the requirements, the calibration is completed, otherwise the measurement device is adjusted and re-verified until the requirements are met and the calibration is completed, so as to ensure that the measurement device has sufficient accuracy in formal use.

[0056] Preferably, in the embodiment, a deflection error table of the measuring device under different use conditions is also established, for example, use measurement data under conditions of different gravity (variation range 0-50 kg), different temperature (0-80 degrees Celsius), etc. is compared with measurement data under use conditions in a standard environment (which can be artificially specified as needed), and a deflection error table is obtained. In step S31, H1 to Hn are corrected according to the deflection error table, so as to reduce the influence of different use environments on the measuring device and improve the measurement accuracy.

[0057] When the measured arc-shaped roller group 1 is the arc-shaped roller group 1 on the lower side of the caster sector, referring to Figure 1 The measuring device can be installed on a carrying device and then placed in the gap between the two arc-shaped roller groups 1. The carrying device is used to carry the measuring device to move from one end of the gap to the other end, and the measurement of all measurement sections is sequentially completed.

[0058] In the embodiment, preferably, when the measurement section is measured, multiple measurements can be performed along the axial direction of the roller 11, and specifically, one measurement is performed at each end of the roller 11. The measurement mode and steps are performed according to the above step S3, so that the arc condition of the measurement section can be more accurately reflected.

[0059] The arc measurement method of the caster sector of the present application can measure the entire arc-shaped roller group multiple times, the measurement mode is the same each time, the position information of each measurement section is obtained, and then the position information of all measurement sections is integrated to obtain the position information of the entire arc-shaped roller group, so as to determine the arc. The entire measurement work has high automation degree, compared with the existing manual measurement mode, the labor intensity and safety risk of personnel are reduced, the arc measurement efficiency and measurement accuracy of the sector are improved, and the offset amount of each roller 11, that is, the adjustment amount required by the arc-shaped roller group 1, can be automatically calculated, which is convenient for maintenance.

[0060] In summary, the present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0061] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A method of measuring the arc of a segment of a continuous caster, characterized in that, The method comprises the following steps: S1, setting a measuring device, the measuring device comprising a base plate (2), a linear guide rail (3) mounted on the base plate (2), a distance meter (4) mounted on the linear guide rail (3), and a displacement recording module for obtaining the displacement of the distance meter (4) on the linear guide rail (3), the base plate (2) having a reference plane (21) parallel to the linear guide rail (3) at the bottom, the distance meter (4) moving linearly along the linear guide rail (3) and facing the reference plane (21); S2, dividing the arc-shaped roller group (1) of the sector segment into several measurement segments from one side to the other side, each measurement segment comprising n carrier rollers (11), n≥2, and at least one carrier roller overlapping between adjacent measurement segments; S3, measuring the position deviation of the carrier rollers in the measurement segment: S31, recording the carrier rollers (11) in the measurement segment from one side to the other side as 1# carrier roller (11) to n# carrier roller (11) respectively, and abutting the reference plane (21) of the measuring device at both ends with the roller surfaces of 1# carrier roller (11) and n# carrier roller (11), and the linear guide rail (3) being perpendicular to the axial direction of the carrier rollers (11); S32. Move the distance measuring instrument (4) from one end of the linear guide rail (3) to the other end. The distance measuring instrument (4) scans the rollers 1# (11) to n# (11) in sequence and collects measurement data. The displacement recording module records the displacement data L of the distance measuring instrument (4). When the distance measuring instrument (4) scans a roller (11), a minimum value will appear, which is recorded as the longitudinal distance H. Record the longitudinal distances from roller 1# (11) to n# (11) as H1 to H2 respectively. n And will be related to H1 to H n The displacement data L at the corresponding positions are denoted as L1 to L2 respectively. n ; S33、according to H1 to H n , and L1 to L n , determine the positions of the 2nd to nth rollers (11) relative to the 1st roller (11), obtain the position information of the measurement section, and confirm the deviation of the 2nd to nth rollers (11); the position determination method of the 2nd to nth rollers (11) is that a coordinate system is established with the center of the 1st roller (11) as the origin, wherein the X axis is parallel to the linear guide rail (3) and the Y axis is along the radial direction of the 1st roller (11); the coordinates of the ith roller (11) are (X i , Y i ), X i = L i -L1, Y i = H i -H1, 2≤i≤n; the deviation determination method of the 2nd to nth rollers (11) is that in the measurement section, the radius of the circular arc where the center of the roller (11) is located is R, the circular angle of the centers of adjacent rollers (11) is θ, for any ith roller (11), 2≤i≤n, the Y-direction deviation ΔY i = H i -H1-a i , a i = 2Rsin[(i-1)θ / 2]sin[(n-i)θ / 2], and when △Y i <0, the ith roller (11) deviates inward, and when △Y i >0, the ith roller (11) deviates outward; the X-direction deviation ΔX i = L i -L1-b i , b i = 2Rsin[(i-1)θ / 2]cos[(n-i)θ / 2], when △X i <0, the ith roller (11) deviates toward the 1st roller (11), and when △X i >0, the ith roller (11) deviates away from the 1st roller (11). S4, sequentially measuring all the measurement segments in the manner of step S3; S5, integrating the position information of all the measurement segments to obtain the arc information of the entire arc-shaped roller group (1) and determine the deviation of each carrier roller (11) in the entire arc-shaped roller group (1).

2. The method of claim 1, wherein: The measuring device further comprises a camera (5) mounted on the linear guide rail (3) and moving synchronously with the distance meter (4), in step S31, the camera (5) simultaneously photographs the measurement segment, and in step S32, when corresponding the data measured by the distance meter (4) with the carrier rollers (11), the camera (5) simultaneously verifies the data.

3. The method of claim 1, wherein: Step S5 further comprises: establishing a model of the arc-shaped roller group (1) according to the arc information of the arc-shaped roller group (1).

4. The method of claim 1, wherein: In step S1, further comprising: after assembling the measuring device, first calibrating the measuring device.

5. The method of claim 4, wherein: The calibration method of the measuring device comprises: measuring the arc-shaped roller group (1) by using a standard measurement arc plate to obtain reference data, measuring the arc-shaped roller group (1) in the same manner as step S3 to obtain measurement data, and comparing the measurement data with the reference data to check, when the error between the two is within a specified range, it is considered that the measuring device meets the requirements, and the calibration is completed, otherwise, adjusting the measuring device and re-comparing and checking until the requirements are met.

6. The method of claim 1, wherein: The step S1 further comprises: establishing a deflection error table of the measuring device under different use conditions; and in the step S31, the H1 to H n are corrected.

7. The method of claim 1, wherein: When the measured arc-shaped roller group (1) is the arc-shaped roller group (1) at the lower side of the sector segment of the continuous casting machine, the measuring device is mounted on a carrying device and then placed in the gap between the two arc-shaped roller groups (1), and the carrying device is used to carry the measuring device to move from one end of the gap to the other end to sequentially complete the measurement of all the measurement segments.

8. The method of claim 1, wherein: In step S3, the measuring device is measured at both ends of the carrier roller (11) once.

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